Connecter



a conduit fitting for a threadless conduit.

Patented July 14, 1931 UNITED STATES PATENT OFFICE GEORGE R. ME'I'CALF, JR., OF ERIE, PENNSYLVANIA, ASSIG-NOR TO ERIE MALLEABLE IRON COMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA CONNEGTER 'Application filed April 4, 1928. Serial No. 267,439.

This invention is designed to facilitate the the coil into clamping engagement with an connection of members, one of which 1s a inserted member. threadless member. As an example of such a In testlmony whereof I have hereunto set connecter I have illustrated the invention as my hand.

GEORGE R. METGALF, JR.

Features and details of the invention will appear from the specification and claims.

A referred embodiment of the invention is illustrated in the accompanying drawings as follows 1 marks a body of the fitting, as shown a conduit box. This is provided with an extension 2 and a guard shoulder 3 thus forming a socket 4 within the extension into which a conduit 5 is inserted.

A coil 6 formed of tubular material is arranged in the socket. Preferably it is of re silient steel. 7

The outer end of the extension is screwthreaded at 7 and a screw 8 operates in the screw thread 7. The screw 8 has an extension 9 which engages the outer end of the coil.

As the screw is set up, the coil is compressed, thus distorting the cross shape of the tube of which the coil is formed and this distortion forces a change in the radial dimension of the coil and in as much as the outer wall prevents the expansion in the exemplification shown the coil is contracted into clamping engagement with the conduit.

What I claim as new is 1. In a connecter, the combination of a coil formed of a tube of hard resilient metal; and means compressing the coil axially distorting the cross shape of the tube to force the walls of the coil radially into clamping engagement with a member to be connected.

2. In a connecter, the combination of a surrounding wall; a coil formed of a tube within the wall said tube being of hard resilient metal; and means compressing the coil distorting the cross shape of the tube to contract 

